Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D403/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00
  • C07D403/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00 containing two hetero rings
  • C07D403/06—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00 containing two hetero rings linked by a carbon chain containing only aliphatic carbon atoms
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K31/00—Medicinal preparations containing organic active ingredients
  • A61K31/33—Heterocyclic compounds
  • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
  • A61K31/495—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with two or more nitrogen atoms as the only ring heteroatoms, e.g. piperazine or tetrazines

Definitions

• the present invention relates to the manufacture of in which the nitrogen atoms of the diazacycloalkane are separated one from the other by at least 2 carbon atoms, and in which pyr-(4) represents a pyrazolyl-(4) radical, X represents oxygen or a hydrogen atom together with a free or substituted hydroxyl group, Z is an aromatic radical and alk represents a lower alkylidene-(lzl) radical, or salts of such compounds, as well as compositions, particularly pharmaceutical compositions containing them and process for their manufacture.
• the compounds and compositions containing them are useful as antihypertensive and psychoactive agents.
• the pyrazolyl-(4) radical is primarily one which is substituted in l-position by a hydrocarbon radical that may be substituted or a monocyclic heterocyclic radical of aromatic character.
• hydrocarbon radicals there may be mentioned low aliphatic hydrocarbon radicals, for example, low alkyl radicals, by which is meant, for example, methyl and ethyl radicals and straight chain and branched propyl, butyl and pentyl radicals bound in any position, and also aliphatic hydrocarbon radicals, for example, cyclopentyl or cyclohexyl radicals, aromatic hydrocarbon radicals, such as phenyl radicals, and araliphatic hydrocarbon radicals.
• Substituents of the aliphatic hydrocarbon radicals in l-position of the pyrazolyl-(4) radical are primarily hydroxyl groups or halogen atoms, for example, chlorine or bromine, or free or substituted amino groups, especially monoor di-low alkylamino groups, alkyleneor oxaor aza-alkyleneamino groups,
• Substituents of the alicyclic radicals are mainly low alkyl radicals, whereas the aromatic radicals may carry, for example, low alkyl or alkoxy groups, halogen atoms, trifluoromethyl groups or nitro or amino groups.
• low alkoxy groups is meant in this case and hereinafter, for example, those having 1 to 5 carbon atoms, primarily methoxy and ethoxy groups.
• I- I eterocyclic radicals in l-position of the pyrazolyl-( 4) radical are principally pyridyl or thienyl radicals, which for example, may be substituted like the aromatic radicals. Preference is given to the pyridyl-(2) radical.
• the new compounds may also contain further substituents in the pyrazole nucleus, especially low alkyl radicals, phenyl radicals or pyridyl radicals, and the phenyl and pyridyl radicals may be substituted in the manner described above.
• the pyrazole nucleus advantageously contains a low alkyl radical in S-position, for example, one of the radicals indicated above, especially a methylradical.
• the hydroxyl group in 3-position of the propyl radical is advantageously free. If it is substituted, it may be an etherified hydroxyl group, e.g. a hydroxyl group substituted with a low aliphatic hydrocarbon radical, for example, a low alkyl or alkenyl radical, for example, a methyl, ethyl, propyl, isopropyl or allyl radical.
• substituted hydroxyl groups may also include esterified hydroxyl groups, for example, those derived from amino-, low alkylamino-, di-low alkylaminoor low alkoxy formic acids or from low alkane carboxylic acids, for example, acetic acid or propionic acid.
• the aromatic radical Z is preferably at most bicyclic and is above all a phenyl or a pyridyl radical each of which may be substituted e.g. as indicated above for the aromatic and heterocyclic radicals in l-position of the pyrazole nucleus.
• the radical alk is a low alkylidene-(lzl) radical, for example, ethylidene-(1:1) or propylidene-(lzl), but more especially methylene.
• diazacycloalkanes there may be mentioned, above all, those in which the nitrogen atoms are separated one from the other by 2 or 3 carbon atoms, especially piperazine and its C-low alkyl substitution products, for example, 2-methylor 2:6-dimethyl-piperazine.
• the new compounds possess valuable pharmacological properties. Thus, they produce a prolonged fall of blood pressure as shown, for example, in tests with animals, such as dogs and cats, including antihypertensive etiects as shown, for example, in tests renal hypertensive rats. Furthermore, compounds of this invention exhibit psychotropic, particularly sedative and tranquilizing properties as shown, for example, in experiments with animals, such as mice, rats, cats and monkeys. They are therefore useful pharmacologically, for example, as. antihypertensive and psychoactive agents.
• R stands for low alkyl or preferably for hydrogen
• Ph is an unsubstituted phenyl radical or a phenyl radical substituted by one or more halogen atoms, such as chlorobromo or fiuoro, trifluoromethyl groups
• low alkyl groups such as methyl
• low alkoxy groups such as methoxy, amino and/or nitro groups
• Q represents a low hydroxy alkyl radical, especially fl-hydroxy-ethyl, or a Ph-low alkyl radical, wherein Ph has the meanings given above, especially B-phenyl-ethyl, and Py represents a pyridyl radical optionally substituted as indicated above for Ph
• R is a low alkyl radical, especially methyl
• R is an unsubstituted phenyl radical or a phenyl radical substituted by one or more low alkyl, low alkoxy, trifluoro
• R is a lower alkyl or preferably hydrogen
• Ph is a halogen-phenyl radical, especially a p-bromophenyl radical or a fiuoro-phenyl radical and R represents fluotime or methoxy or methyl or chlorine or trifluoromethyl group
• the halogen-atom and methoxy group being advantageously in ortho or para position, especially N-[S-(l- (4-bromophenyl) 5 methyl-4-pyrazollyl)-3-oxo-1-propyl]-N-(Z-methoxy-phenyl)-piperazine of the formula and N-[3-(1-(4-bromophenyl)-5-methy1 4 pyrazolyl)- 3-OX0 1 propyl]-N-(2-methyl-phenyl-piperazine of the formula and N-[3-(1-(2-fiuorophenyl) 5 methyl-4-pyrazoly1)- 3-
• the new compounds are obtained by methods in themselves known.
• the procedure is to react a 4-low alkanoyl pyrazole with formaldehyde and an N-unsubstituted N'-Z-diazacyclo alkane whose nitrogen atoms are separated one from the other by at least 2 carbon atoms and wherein Z has the meanings given above or an amino compound having at least one hydrogen atom attached to the nitrogen atom and that permits the formation of an N'-Z-diazacyclo alkane ring or to react a wherein X and alk have the meanings given above and Y is a reactive esterified hydroxyl group, with the said N'-2-diazacyclo alkane or amino compound and, in the compounds thus obtained, to form N-Z-diazacycloalkane ring with the aforementioned group that permits the formation of an N'-Z-diazacycloalkane ring and, at any stage of the process if desired or required, to reduce the oxo group to a hydroxyl group and, if desired or
• the reaction with formaldehyde and the N-Z-diazacycloalkane or the amino compound is carried out in accordance with the Mannich reaction.
• an agent that yields formaldehyde may be used, for example, trihydroxymethylene or paraformaldehyde, if desired or required, in the presence of an acid.
• the amino compound is advantageously used in the form of a salt.
• the reaction is performed in a diluent, for example, in an alcohol or dioxan.
• reaction When using polymerization products of formaldehyde the reaction is advantageously carried out in an organic diluent, as indictaed above, or in benzene, toluene, nitrobenzene or nitromethane.
• the reaction is advantageously carried out at an elevated temperature and/ or in a closed vessel.
• Y is preferably a halogen atom or a sulphonyloxy, such as a benzene sulphonyloxy group, e.g.
• the ptoluene sulphonyloxy group, and X is advantageously an oxo group, with the N-Z-diazacycloalkane or the amino compound is carried out in the usual manner, advantageously in the presence of an acid binding material, such as a basic condensing agent.
• amino compound that permits the formtaion of an N'-Z-diazacycloalkane ring there may be used ammonia or more especially a primary or secondary amine whose substituents permit ring closure to form an N-Z-diazacycloalkane.
• radicals are, for example, alkyl radicals that contain in fi-position or in a higher position an N- Z-amino group having at least 1 hydrogen atom or a free hydroxyl group or a hydroxyl group made reactive by esterification.
• the free amino group may be reacted with a reactive diester of an appropriate N-Z-dihydroxyalkyl amine to form the N'-Z-diazacycloalkane ring.
• the above-mentioned amines that have substituents that permit the formation of the N-Z-diazacycloalkane ring attached to the amino group may also be formed from the free amino group by simultaneous or stepwise monoor di-substitution with reactive derivatives of alcohols that contain in fl-position or in a higher position, an N-Z-amino group having at least 1 hydrogen atom or a free hydroxyl group or a hydroxyl group made reactive by esterification such as with their reactive esters or corresponding epoxides.
• the said hydroxyalkyl radical is, if necessary, first made reactive by esterification and then reacted with a primary or secondary N-Z-amine and then with the reactive diester of an appropriate alkane-diol.
• the ring is closed by reaction with the N-Z-amine, if necessary, after the hydroxyl groups have been made reactive by esterification.
• Di-(secondary -aminoalkyl)-amino compounds that are obtained may be cyclicized directly.
• the reduction of the oxo group is carried out in the customary manner.
• Metallic reduction is advantageous for example, by a treatment with sodium in alcohol, or with complex metal hydrides, for example, sodium-boron hydride, or by catalytically activated hydrogen in the presence of a hydrogenation catalyst, for example, a platinum,
• palladium, nickel, copper or rhodium catalyst for example, platinum oxide, palladium charcoal, Raney nickel, copper chromite or rhodium on a carrier such as alumina or charcoal.
• the reaction is advantageously carried out in the presence of a diluent and/ or solvent at a low temperature, room temperature or an elevated temperature in an open vessel or in a closed vessel under pressure.
• the reduction of the oxo group can be effected by the Meerwein-Ponndorf-Verley method,
• the oxo compound may be treated in the customary manner with a low alkanol, for example, isopropanol, in the presence of an appropriate alcoholate, for example, aluminium isopropylate.
• the etherification or esterification of a free hydroxyl group in 3-position of the propyl radical is carried out in the usualmanner.
• diazo compounds for instance, diazoalkanes
• a suitable Lewis acid for example, fiuoboric acid, aluminium chloride, boron trifluoride etherate or aluminum low alkanolate, or a metal salt is formed and reacted with a reactive ester of an alcohol, or the hydroxyl group is made reactive by esterification in that it is exchanged for a halogen atom or is converted into a sulphonyloxy group, and is then reacted with an alcohol, advantageously in the form of a metal salt.
• a suitable Lewis acid for example, fiuoboric acid, aluminium chloride, boron trifluoride etherate or aluminum low alkanolate, or a metal salt is formed and reacted with a reactive ester of an alcohol, or the hydroxyl group is made reactive by esterification in that it is exchanged for
• esterification is advantageously effected by reaction with acid halides, acid anhydrides, ketenes, isocyanates or isothiocyanates, if desired or required, in the presence of condensing agents such as bases in order to bind any acid that might form.
• the subsequent reduction of nitro groups is likewise carried out in the customary manner, for example, with catalytically activated hydrogen, nascent hydrogen or by means of metal hydrides, for example, lithium-aluminium hydride or sodium-boron hydride.
• This reduction may be carried outsimultaneously with the reduction of the oxo group, whereby N-benzyl groups may also be hydrogenolysed.
• Hydroxyl groups made reactive by esterification as indicated in the above-mentioned reactions are, above all, those that are derived from strong inorganic acids, for example, a hydrohalic acid or sulphuric acid, or from strong organic sulphonic acids, e.g. benzene sulphonic acids, such as toluene sulphonic acids.
• esterification of hydroxyl groups to make them reactive is carried out by methods in themselves known, for example, by means of halides of sulphur or phosphorus, especially thionyl chloride, or by means of sulphonyl halides.
• the reactions are carried out in the usual manner at room temperature, at a reduced temperature or at an elevated temperature, in an 13 open or closed vessel, if desired or required, under superatmospheric pressure, in the presence or absence of diluents and/ or catalysts, and/ or condensing agents.
• the new compounds are obtained either in the free form or in the form of their salts.
• the salts of the compounds of the present invention are acid addition salts, for example, pharmaceutically useful acid addition salts, primarly those of inorganic acids, for example, hydrochloric acid, hydrobromic acid, nitric acid, sulphuric acid or phosphoric acid, but also of organic acids, for example, organic carboxylic acids, for instance, acetic acid, propionic acid, glycolic acid, malonic acid, succinic acid, maleic acid, hydroxymaleic acid, dihydroxymaleic acid, fumaric acid, malic acid, tartaric acid, citric acid, benzoic acid, cinnamic acid, mandelic acid, salicylic acid, 4-amino-salicylic acid, 2- phenoxy-benzoic acid, 2-acetoxy-benzoic acid, pamoic acid, glucuronic acid, nicotinic acid or isonicotinic acid, or of organic sulphonic acids, for example, methane sulphonic acid, ethane sulphonic acid
• Acid addition salts may be used as intermediate products, for example, in the purification of the free compounds or in the preparation of other salts, and also for identification.
• Salts that are specially prepared for identification are, for example, those of acidic organic nitro compounds, for example, picric acid, picrolonic acid or flavianic acid, or of metal-complex acids, for example, phosphotungstic acid, phosphomolybdic acid, chloroplatinic acid or Reinecke acid.
• the monoor poly-salts may be prepared therefrom.
• the salts obtained may be converted into the free bases, for example, by a treatment with a base, for example, with a metal hydroxide, for instance, lithium hydroxide, sodium hydroxide, potassium hydroxide or calcium hydroxide, a metal carbonate, for example, sodium, potassium or calcium carbonate or hydrogen carbonate, ammonia or with a suitable hydroxyl ion exchanger.
• a metal hydroxide for instance, lithium hydroxide, sodium hydroxide, potassium hydroxide or calcium hydroxide
• a metal carbonate for example, sodium, potassium or calcium carbonate or hydrogen carbonate, ammonia or with a suitable hydroxyl ion exchanger.
• the salts obtained may be converted into other salts, for example, by treating a salt of an inorganic acid with a suitable metal salt, for example, the sodium, barium or silver salt of an acid in a suitable solvent in which the new salt that is formed is insoluble and thus precipitates out of the reaction mixture, or by treatment with an ion exchanger.
• a suitable metal salt for example, the sodium, barium or silver salt of an acid in a suitable solvent in which the new salt that is formed is insoluble and thus precipitates out of the reaction mixture, or by treatment with an ion exchanger.
• the free bases obtained may be converted into their acid addition salts by reaction with acids, for example, with the above-mentioned acids, for example, by treating the solution of a base in a suitable inert solvent or mixture of solvents with an acid or with a solution thereof, or with a suitable anion exchanger, and isolating the desired salt.
• the monoor poly-salts may also be obtained in the form of their hydrates or contain the solvent used for crystallization. Owing to the close relationship between the new compounds in the free form and in the form of a salt thereof, whenever a free compound is referred to in this context, a corresponding salt is also intended, provided such is possible or appropriate under the circumstances.
• the racemates obtained may be resolved into the optically active (1 and 1 forms by known methods, for example, by crystallization from optically active solvents or by treatment of the racemic compound with one of the optically active forms of an acid with an asymmetrical carbon atom, advantageously in the presence of a suitable solvent.
• Specially suitable for this purpose are d-tartaric- (l-tartaric) acid and l-tartaric-(d-tartaric) acid, and also the optically active forms of malic acid, mandelic acid, camphor-lO-sulphonic acid or quininic acid.
• the salts obtained may be converted into other salts or into the free and optically active bases, and an optically active base may be converted into an acid addition salt by the methods described above.
• the invention further includes any variant of the present process in which an intermediate product obtainable at any stage of the process is used as starting material and any remaining steps are carried out, or the process is discontinued at any stage thereof, or in which a starting material is formed under reaction conditions.
• the invention also includes any new intermediate products that are formed.
• the compounds of the present invention are intended for use as medicaments, for example, in the form of pharmaceutical preparations that contain these compounds in admixture or conjunction with an organic or inorganic, solid or liquid pharmaceutical excipient suitable for enteral, for example, oral, or parenteral. administration.
• the pharmaceutical preparations may be, for example, tablets, dragees or capsules, or in liquid form as solutions, suspensions or emulsions. They may contain assistants such as preserving, stabilizing, Wetting or emulsifying agents, salts for regulating the osmotic pressure, buffers, dyestuifs or flavouring. They may further contain other therapeutically valuable substances.
• EXAMPLE 2 4 g. of 1-phenyl-4-acetyl-S-methyl-pyrazole and 2.7 g. of paraformaldehyde in 50 ml. ethanol are treated with 4.7 g. of N-(p-chlorophenyl)-piperazine dihydrochloride and cone. hydrochloric acid (4 drops). The reaction mixture is boiled under reflux overnight. On cooling, the N- [3 1-phenyl-5-methyl-4-pyrazolyl)-3-oxo-1-propyl]-N'- (4-chloropheny1) -piperazine hydrochloride of the formula crystallizes out. 'On recrystallization from ethanol-ethyl acetate it melts at 23 3234 C.
• EXAMPLE 6 6 g. of 1-phenyl-4-acetyl-5-methylpyrazole and 5.4 g. of paraformaldehyde in 120 ml. of ethanol are treated with 9.06 g. of N-(m-trifluoromethyl-phenyl)-piperazine hydrochloride and conc. hydrochloric acid (4 drops). The reaction mixture is boiled under reflux overnight. On cooling, the N-[3-(l-phenyl-5-methyl-4-pyrazolyl)-3-oxol. 6 1 -propyl] -N- 3-trifluoromethyl-phenyl -piperazine hydrochloride of the formula CH3 C Fa lTl .1101
• EXAMPLE 7 8 g. of 1-phenyl4-acetyl-5-methylpyrazole and 7.2 g. of paraformaldehyde in 120 ml. of ethanol are treated with 10.49 g. of N-(p-fluorophenyl)-piperazine hydrochloride and conc. hydrochloric acid (8 drops). The reaction mixture is boiled under reflux for 24 hours. On cooling, a crystalline product is formed which is recrystallized from methanol-ethyl acetate.
• EXAMPLE 8 2 g. of 1-phenyl-4-acetyl-5-methylpyrazole and 1.8 g. of paraformaldehyde in 30 ml. of ethanol are treated with 2.82 g. of Z-methyl 5 chloro-phenyl-piperazine hydrochloride. The reaction mixture is boiled under reflux with cone. hydrochloric acid (4 drops) overnight. On cooling, the N-[3-(l-phenyl-5-methyl-4 pyrazolyl) 3 oxo 1- propyl]-N'-(2-methyl-5-chlorophenyl) piperazine hydrochloride of the formula CH3 CH I .HCI
• EXAMPLE 9 4 g. of 1-phenyl-4-acetyl-5-methyl pyrazole and 3.6 g. of paraformaldehyde in 60 ml. of ethanol are treated with 5.62 g. of N-(2-methyl-4-chlorophenyl)-piperazine hydrochloride and cone. hydrochloric acid (4 drops). The reaction mixture is boiled under reflux overnight. On cooling, the N-[3-(1-phenyl-5-methyl-4 pyrazolyl) 3 oxo 1- 1 '7 propyl]-N'-(2-methyl-4-cbloro-phenyl)-piperazine hydrochloride of the formula crystallizes.
• the starting material is obtained as follows:
• EXAMPLE 13 6 g. l-phenyl-4-acetyl-5-methyl-pyrazole and 4 g. paraformaldehyde in m1. of ethanol are treated with 5.3 g. N-p-methoxypheny1-piperazine dihydrochloride and conc. hydrochloride acid (4 drops). The reaction mixture is boiled under reflux for 24 hours. On cooling, the N[3(1-phenyl-5 methyl-4-pyrazolyl)-3-oxo-1-propyl]- N-(4-methoxyphenyl) piperazine hydrochloride crystallizes out in the form of its hemihydrate. It has the for- .HOl gmo and melts at 218 C. (dec.).
• EXAMPLE 14 6 g. of 1-phenyl-4-acetyl-5-methyl pyrazole and 5.4 g. paraformaldehyde in 90 ml. of ethanol are treated with 8 g. N-m-chlorophenyl piperazine dihydrochloride and conc. hydrochloric acid (4 drops). The reaction mixture is boiled under reflux overnight. On cooling, the N-[3-(1- phenyl 5 methyl-4-pyrazolyl)-3oxo-1-propyl]-N'-(3- chlorophenyl)-piperazine hydrochloride of the formula crystallizes out. After recrystallizations from ethanolethyl acetate, it melts at 225 C. (dec.).
• EXAMPLE 15 6 g. 1-phenyl-4-acetyl-S-rnethyl-pyrazo'le and 4 g. paraformaldehyde in 100 ml. of ethanol are treated with 6.8 g. N-(2,6-dimethylphenyl)-piperazine hydrochloride and cone. hydrochloric acid (4 drops). The reaction mixture is boiled under reflux overnight. On cooling, the N-[3-(1- 1 9 phenyl--methyl 4 pyrazolyl)-3-oxo-1-propyl]-N'-(2,6- dimethylphenyl)-piperazine hydrochloride of the formula crystallizes out. After recrystallizations from ethanolether, it melts at 212 C. (dec.).
• EXAMPLE 16 6 g. 1-phenyl-4-acetyl-5-methyl-pyrazole and 4 g. para formaldehyde in 100 ml. of ethanol are treated with 5.3 g. N-o-methoxyphenyl piperazine hydrochloride and cone. hydrochloric acid (4 drops). The reaction mixture is boiled under reflux overnight. On cooling, the N-[3-(1- phenyl 5 methyl 4-pyrazolyl)-3-oxo-1-propyl]-N'-(2- methoxyphenyl)-piperazine hydrochloride crystallizes out as its hemihydrate. It has the formula and melts at 206 C. (dec.).
• EXAMPLE 17 6 g. 1-phenyl-4-acetyl-5-methyl-pyrazole and 4 g. parafonnaldehyde in 140 ml. of ethanol are treated with 6.8 g. N-(2,3-dimethylphenyl)-piperazine hydrochloride and conc. hydrochloric acid (4 drops). The reaction mixture is boiled under reflux overnight. On cooling, the N-[3-(1- phenyl 5 methyl-4-pyrazolyl)-3-oxo-1-propyl]-N-(2,3- dimethylphenyl)-piperazine hydrochloride crystallizes out as its hemihydrate. It has the formula .HCl
• EXAMPLE 20 6 g. 1-phenyl4-acetyl-S-methyl-pyrazole and 4 g. paraformaldehyde in ml. of ethanol are treated with 9 g. N (o trifluoromethylphenyl)piperazine hydrochloride and cone. hydrochloric acid (4 drops). The reaction mixture is boiled under reflux overnight. O11 cooling, the N- [3-(1-phenyl 5 methyl-4-pyrazolyl)-3-oxo-1-propyl]- N'-(2-trifluoromethylphenyl)-piperazine hydrochloride of the formula crystallizes out. After recrystallizations from ethanolethyl acetate, it melts at 210 C. (dec.).
• EXAMPLE 21 8.4 g. of 1-(p-bromophenyl)-4-acety1 5 methylpyrazole and 4 g. paraformaldehyde in 100 ml. of ethanol are treated with 5.3 g. N-(Z-methoxyphenyl)-piperazine hydrochloride and cone. hydrochloric acid (4 drops). The reaction mixture is boiled under reflux overnight. On cooling, the N [3 (1 p 'bromophenyl 5 methyl-4- pyrazolyl) 3 oxo l propyl]-N-(2-methoxyphenyl)- piperazine hydrochloride of the formula crystallizes out. After recrystallizations from methanolethyl acetate, it melts at 198-200 C. (dec.).
• the starting material is obtained as follows:
• EXAMPLE 23 crystallizes out. After recrystallization from ethanol, it melts at 230 C. (dec.).
• the starting material is obtained as follows:
• EXAMPLE 25 A solution of 5 g. of N [3 (1 phenyl 5 methyl- 4 pyrazolyl) 3 oxo 1 propyl] N (2 methylphenyl)-piperazine hydrochloride in 100 ml. 50% aq. methanol is dropwise added to a solution of 0.5 g. sodium borohydride in 60 ml. 50% aq. methanol, at room temperature. After the addition, the reaction mixture is stirred for 30 min. at room temperature, then stirring is continued at 45-50 for 2 hours and finally it was boiled under reflux for 15 minutes.
• EXAMPLE 28 A solution of 2 g. of N-[3-(1-phenyl-5-methyl-4-pyraz olyl)-3-oxo-1-propyl]-N-(2-methoxyphenyl) piperazine hydrochloride hemihydrate in 25 ml. 50% aq. methanol is added dropwise under stirring at room temperature to a solution of 0.2 g. sodium borohydride in 25 ml. 50% aq. methanol. After the addition, the reaction is stirred for 30 minutes at room temperature, then the stirring is continued at 4550 for 2 hours and finally it is boiled under reflux for 15 minutes.
• EXAMPLE 29 A solution of 2 g. of N-[3-(1-phenyl-5-methyl-4-pyrazolyl -3-oxo-1-propyl] -N'- (Z-fluorophenyl -piperazine hydrochloride in 35 ml. 5 0% aq. methanol is added dropwise under stirring at room temperature to a solution of 0.2 g. sodium borohydride in 25 ml. 50% aq. methanol. After the addition, the reaction mixture is stirred for 30 minutes at room temperature, then the stirring is continued at 4550 for 2 hours and finally it is boiled for 15 minutes.
• EXAMPLE 30 A solution of 700 mg. N-[3-(1-p-nitro-phenyl-5-methyl- 4-pyrazolyl)-3-oxo-1-propyl] N (4 fiuorophenyl)- piperazine hydrochloride in 50 ml. of 50% aq. methanol is dropwise added under stirring at room temperature to a solution of 70 mg. sodium borohydride in 20 ml. 50% aq. methanol. After the addition, the reaction mixture is stirred for 30 minutes at room temperature and then stirred at 45-50 C. for 2 hours and finally boiled for 15 minutes. It is allowed to stand overnight as such and the solvent is evaporated to dryness under reduced pressure.
• EXAMPLE 31 crystallizes out. It is recrystallized from ethanol and melts at 122 C.
• EXAMPLE 32 A solution of 1.5 g. of N-[3-(l-phenyl-5-methyl-4- pyrazolyl)-3-oxo-1-propyl] N 4 -methoxyphenyl)- piperazine hydrochloride hemihydrate in 25 ml. 50% aqueous methanol is added dropwise under stirring at room temperature to a solution of 0.15 g. sodium borohydride in 50 ml. 50% aqueous methanol. After the addition, the reaction is stirred for 30 minutes at room temperature, then the stirring is continued at 45-50 for 2 hours and finally it is boiled under reflux for 15 minutes.
• N-[3-(1-phenyl5-methyl-4-pyrazolyl) 3 hydroxy-l-propyl] N (4 methoxyphenyl)-piperazine of the formula crystallizes out. It is recrystallized from ethanol and melts at 150 C.
• EXAMPLE 35 8 g. 1-phenyl-4-acetyl-S-methyl pyrazole and 7.2 g. paraformaldehyde in 120 m1. of ethanol are treated with 9.4 g. N-phenylpiperazine dihydrochloride and conc. hydrochloric acid (4'drops). The reaction mixture is boiled under reflux overnight. The solvent is evaporated off and the residue is treated with a saturated solution of sodium bicarbonate. The base is extracted with ethyl acetate and the extract is dried over anhydrous potassium carbonate and the solvent removed. The residue is dissolved in benzene and filtered through alumina column to give pure base of the formula which crystallizes out on cooling. After recrystallizations from methanol, it melts at 150 C. (dec.).
• EXAMPLE 36 4.4 g. 1-(p-fluorophenyl)-4-acetyl- 5 methyl-pyrazole and 3 g. paraformaldehyde in 65 ml. of ethanol are treated with 5 g. N-(Z-methylphenyl)-piperazine hydrochloride and conc. hydrochloric acid (4 drops). The reaction mixture is boiled under reflux overnight. On cooling, the N-[3-(l-p-fluorophenyl 5 methyl-4-pyrazolyl)-3-oxo-1- propyl]-N'-(2-methylphenyl)-piperazine hydrochloride of the formula 0 iLCHrCHz-N NQ ⁇ N;
• EXAMPLE 38 6 g. of 1-phenyl-4-acetyl-5-methyl pyrazole and 4.8 g. paraformaldehyde in ml. of ethanol are treated with 8.9 g. N-(Z-ethylphenyl)-piperazine hydrochloride and conc. hydrochloric acid (4 drops). The reaction mixture 27 is boiled under reflux overnight. On cooling, the N-[3-(1- phenyl--methyl-4-pyrazolyl)-3-oxo-l-propyl] N (2- ethylphenyl)-piperazine hydrochloride of the formula crystallizes out. After recrystallization from ethanol-ethyl acetate, it melts at 206 C. (dec.).
• EXAMPLE 39 4.2 g. of l-(p-bromophenyl)-4-acetyl-5-methyl-pyrazole and 2.4 g. of paraformaldehyde in 60 ml. of ethanol are treated with N-(Z-ethylphenyl)-piperazine hydrochloride and conc. hydrochloric acid (4 drops). The reaction mixture is boiled under reflux overnight. On cooling, the N- [3 (1-p-bromophenyl-5-methyl-4-pyrazolyl) 3 oxo-lpropyl]-N'-(2-ethylphenyl)-piperazine hydrochloride of the formula crystallizes out. After recrystallization from methanolethyl acetate, it melts at 204 C. (dec.).
• EXAMPLE 40 4.2 g. of 1-( p-bromophenyl)-4-acetyl-S-methyl-pyrazole and N-(2-fluorophenyl)-piperazine hydrochloride and conc. hydrochloric acid (4 drops). The reaction mixture is boiled under reflux overnight. On cooling, the N-[3- (1-p-bromophenyl-5-methyl-4-pyrazolyl) 3 oxo 1- propyl]-N'-(2-fluorophenyl)-piperazine hydrochloride of crystallizes out. After recrystallization from ethanol-ether acetate, it melts at 214 C. (dec.).
• EXAMPLE 41 4.2 g. l-(p-bromophenyl)-4-acetyl-5-methyl-pyrazole and 2.4 g. paraformaldehyde in 60 ml. of ethanol are treated with 3.5 g. N-(2-chlorophenyl)-piperazine hydrochloride and conc. hydrochloric acid (4 drops). The reaction mixture is boiled under reflux overnight. On cooling, the N-[3-(1-p-bromophenyl-S-methyl-4-pyrazolyl)-3- 28 oxol-propyl] -N'- 2-chlorophenyl -piperazine hydrochloride of the formula N 0 Ha- Cl crystallizes out. After recrystallization from methanolethyl acetate, it melts at 202 C. (dec.).
• EXAMPLE 42 A solution of 3 g. of N-[3-(1-phenyl-5-methyl-4-pyrazolyl)-3-oxo-1-propyl] N (3-chlor0phenyl)-piperazine hydrochloride in 40 ml. 50% aq. methanol is added drop- Wise under stirring at room temperature to a solution of 0.30 g. sodium borohydride in 35 ml. 50% aq. methanol. After the addition, the reaction is stirred for 30 minutes at room temperature, then the stirring is continued at 45-50 for 2 hours and finally it is boiled under reflux for 15 minutes.
• N-[3-(1-phenyl-5-methyl-4- pyrazolyl)-3-hydroxy-l-propyl] N (3-chlorophenyl)- piperazine of the formula crystallizes out. It is recrystallized from 50% aq. methanol and melts at C.
• EXAMPLE 44 4.7 g. of N-[3-(1-p-nitrophenyl-5-methyl-4-pyrazolyl)- 3-oxo-l-propyl]-N-(4 fluorophenyl)-piperazine hydrochloride dissolved in 500 ml. of ethanol is hydrogenated over 0.7 g. of 10% palladium-carbon catalyst at room temperature and pressure. After the theoretical uptake of hydrogen, the hydrogenated solution is filtered, evaporated to dryness and the residue is recrystallized from methanol-ethyl acetate.
• EXAMPLE 45 2.2 g. 1(p-fluorophenyl)-4-acetyl-5-methyl-pyrazole and 1.8 g. paraformaldehyde in 35 m1. of ethanol are treated with N-(Z-methoxyphenyl)-piperazine hydrochloride and conc. hydrochloric acid (4 drops). The reaction mixture is boiled under reflux overnight. On cooling, the N-[3-(1-p-fluorophenyl 5 methyl-4-pyrazolyl)-3-oxo-1- propyl]-N-(2methoxyphenyl)piperazine hydrochloride of the formula OCH;
• EXAMPLE 46 1.2 g. l-(p-fluorophenyl)-4-acetyl-5-methyl-pyrazole and 0.9 g. paraformaldehyde in 35 ml. of ethanol are treated with N-(2-chlorophenyl)-piperazine hydrochloride and conc. hydrochloric acid (4 drops). The reaction mixture is boiled under reflux overnight. n cooling, the N-[3-(1-p-fluorophenyl 5 methyl-4-pyrazolyl)-3-oxol-propyl]-N-(2chlorophenyl)piperazine hydrochloride of the formula crystallized out. After recrystallization from isopropanolethyl acetate, it melts at 238 (dec.).
• EXAMPLE 47 8.4 g. of 1-(,B-hydroxyethyl)-4-acetyl-5-methyl-pyrazole and 8 g. of paraformaldehyde in 200 ml. of ethanol are treated with 12.5 g. of N-(Z-methylphenyl)-piperazine hydrochloride and conc. hydrochloric acid (4 drops). The reaction mixture is boiled under reflux overnight.
• EXAMPLE 49 2 g. of N-[3-(l-phenyl-5-methyl-4-pyrazolyl)-3-hydroxy-l-propyl]-N-(2-methoxyphenyl)-piperazine is dissolved in 75 ml. tetrahydrofuran. This solution was treated with 0.5 g. acetyl chloride and pyridine (1 drop). The reaction mixture was boiled under reflux for 4 hours and set aside for 18 hours at room temperature when N-[3- (l-phenyl 5 methyl-4-pyrazolyl)-3-acetoxy-1-propyl]- N'- (2-methoxyphenyl)-piperazine hydrochloride monohydrate of the formula II O.C--CH;
• EXAMPLE 50 5.75 g. of N [3 (1 phenyl 5 methyl 4- pyrazolyl) 3 hydroxy propyl] N (2 methylphenyl) piperazine is dissolved in 275 ml. of dry benzene and dry hydrogen chloride gas is passed until pH 2, stirred for 15 minutes and 5.4 g. of thionylchloride in 180 ml. of dry benzene is quickly added. The reaction mixture is boiled under reflux for 4 /2 hours and thereafter the excess of thionyl chloride and benzene is distilled off completely. The residue is dissolved in 120 ml. of absolute ethanol and the solution cooled to 10 C. A solution of 2.3 g. sodium in 60 ml.
• EXAMPLE 51 8.4 g. of 1 (B hydroxyethyl) 4 acetyl 5 methylpyrazole and 8 g. of paraformaldehyde in 200 ml. of ethanol are treated with 11.6 g. of N (2 chlorophenyl)- piperazine hydrochloride and conc. hydrochloric acid (4 drops). The reaction mixture is boiled under reflux overnight. On cooling, the N [3 (1 ,8 hydroxyethyl- 5 methyl 4 pyrazolyl) 3 oxo 1 propyl]-N- (2-chlorophenyl)-piperazine hydrochloride monohydrate of the formula Hz-CHr-OH crystallizes out. After recrystallizations from ethyl acetate-ether it melts at 200 C. (dec.).
• EXAMPLE 52 4 g. of 1 3 hydroxyethyl) 4 acetyl S-methylpyrazole and 4 g. of paraformaldehyde in 75 ml. of ethanol is treated with 5 g. of N (2 fluorophenyl)- piperazine hydrochloride and conc. hydrochloric acid (3 drops). The reaction mixture is boiled under reflux overnight. On cooling, the product crystallizes out. It is recrystallized from ethyl acetate.
• EXAMPLE 53 A solution of 3.8 g. of N [3 (1 p bromophenyl- 5 methyl 4 pyrazolyl) 3 OX0 1 propyl] N'- (4 fluorophenyl) piperazine hydrochloride in 100 ml. of 50% aq. methanol is dropwise added to a solution of 0.38 g. of sodium borohydride in 50 ml. 50% aq. methanol at room temperature. After the addition, the reaction mixture is stirred for mins. at room temperature, the stirring is continued at 50 for 1 hour and it is boiled under refluX for 15 minutes.
• EXAMPLE 5 4 2 g. of 1 phenyl 4 acetyl 5 methylpyrazole and 1.45 g. of paraformaldehyde in 25 ml. of ethanol is treated with 3.7 g. of N (3,5 bis trifluoromethylphenyl) piperazine dihydrochloride and conc. hydrochloric acid (4 drops). The reaction mixture is boiled under reflux overnight. On cooling at 0 for 40 days, a hygroscopic solid is obtained. This is dissolved in 20 ml. water, basified with 10% sodium carbonate and extracted into ether. The ethereal extract is dried over anhydrous potassium carbonate and evaporated off to dryness.
• EXAMPLE 5 A solution of 1 8 g. of N [3 (1 phenyl-5-methyl-4- pyrazolyl) 3 oxo 1 propyl] N'-(2-chlorophenyl)- piperazine hydrochloride in 250 ml. of 50% aq. methanol is added portionwise under stirring at room temperature to a solution of 1.8 g. sodium borohydride in 150 ml. 50% aq. methanol. After the addition, the reaction mixture is stirred for 30 minutes at room temperature, then the stirring is continued at 45-50" for 6 hours and finally it is boiled under reflux for 15 minutes.
• EXAMPLE 5 6 5.6 g. 1 (p bromophenyl) 4 acetyl 5 methylpyrazole and 3.2 g. paraformaldehyde in ml. of ethanol are treated With 5 g. N-(3-fluorophenyl)-piperazine hydrochloride and conc. hydrochloric acid (4 drops).
• EXAMPLE 57 4.5 g. of l-(fi-phenethyl)-4-acetyl-5-methy1 pyrazole and 3.2 g. of paraformaldehyde in 100 ml. ethanol are treated with N-(Z-methylphenyl)-piperazine hydrochloride and cone. hydrochloric acid (4 drops). The reaction mixture is boiled under reflux overnight. On cooling, the N-[3-(1-5-phenethyl 5 methyl 4 pyrazolyl) 3- oxo-l-propyl] N (Z-methylphenyl)-piperazine hydrochloride hemihydrate of the formula om-cmQnoruzmo crystallizes out. After recrystallizations from methanolether, it melts at 185 C. (dec.).
• the starting material is obtained as follows:
• EXAMPLE 58 8.37 g. of 1-(2,5 dichlorophenyl) 4 acetyl methyl pyrazole and 4.8 g. paraformaldehyde in 100 ml. of ethanol are treated with 7.53 g. of N-(4-fluorophenyl)- piperazine hydrochloride and cone. hydrochloric acid (4 drops). The reaction mixture is boiled under reflux overnight. On cooling, the N-[3- ⁇ 1-(2,5-dichlorophenyl)- 5-methyl-4-pyrazolyl ⁇ -3-oxo-1-propyl] N (4 fluorophenyl)-piperazine hydrochloride of the formula crystallizes out. After recrystallizations from methanolether, it melts at 226 C. (dec.).
• the starting material is obtained as follows:
• EXAMPLE 59 8.37 g. of 1 (2,5-dichlorop'henyl)--4-acetyl-5-methyl pyrazole and 4.8 g. of paraformaldehyde in ml. of ethanol are treated with 7.31 g. of N-(Z-methylphenyD- piperazine hydrochloride and cone. hydrochloric acid (4 drops). The reaction mixture is boiled under reflux overnight. On cooling, the N-[3- ⁇ 1-(2,5-dichlorophenyl) 5- methyl 4 pyrazolyl ⁇ 3 oxo 1 propyl] N (2- methylphenyD-pipcrazine hydrochloride hemihydrate of the formula crystallizes out. After recrystallizations from methanolether, it melts at 202 C. (dec.).
• the starting material is obtained as follows:
• EXAMPLE 64 4.4 g. 1- (p-fluorophenyl)-4-acetyl-S-methyl-pyrazole and 3.2 g. paraformaldehyde in 70 ml. of ethanol are treated with 5 g. of N-(4-fluorophenyl)-piperazine hydrochloride and cone. hydrochloric acid (4 drops). The reaction mixture is boiled under reflux overnight.
• EXAMPLE 66 4.4 g. 1-(p-fluorophenyl)-4-acetyl-5-methylpyrazole and 3.2 g. paraformaldehyde in 60 ml. of ethanol are treated with 5 g. of N-(Z-fluorophenyl)-piperazine hydrochloride and cone. hydrochloric acid (4 drops). The reaction mixture is boiled under reflux overnight. On cooling, the N- [3 (1 p fluorophenyl-S-methyl-4-pyrazolyl)-3-oxo-lpropyl] -N-( Z-fluorophenyl)-piperazine hydrochloride of the formula .lICl
• the starting material is obtained as follows:
• EXAMPLE 68 g. of 1-(2'pyridyl)-4-acetyl-S-methyl-pyrazole and 4 g. of paraformaldehyde in 80 ml. of ethanol is treated with 6 g. of N-(Z-chlorophenyl)-piperazine hydrochloride and conc. hydrochloric acid (4 drops).
• the reaction mixture is boiled under reflux overnight. O11 cooling, the N- [3 ⁇ 1 (2 pyridyl) 5-methyl-4-pyrazolyl ⁇ -3-0xo-1- propyl]-N-(2-chlorophenyl)-piperazine hydrochloride of the formula crystallizes out. After recrystallizations from methanol, it melts at 222 C. (dec.).
• EXAMPLE 69 8.4 g. of 1 (5 bromo Z-pyridyl)-4-acetyl-5-methy1- pyrazole and 4.8 g. of paraformaldehyde in 100 ml. of ethanol is treated with 7.53 g. of N-(4-fluorophenyl)- piperazine hydrochloride and conc. hydrochloric acid (4 drops). The reaction mixture is boiled under reflux overnight.
• the starting material is obtained as follows:
• the ethyl acetate extract is dried and acidified with dry hydrogen chloride to afford the N-[.3- ⁇ l-(2-pyridyl)- 5-rnethyl-4-pyrazolyl ⁇ -3-hydroxy-1-propyl] -N-(2 chlorophenyl)-piperazine hydrochloride of the formula It is recrystallized from methanol-ether and melts at 210 C.
• EXAMPLE 72 crystallizes out. After recrystallization from methanolether, it melts at 220 C. (dec.).
• EXAMPLE 78 4 g. of 1-(4-pyridyl)-4-acetyl-5-methylpyrazole and 3.2 g. of paraformaldehyde in 70 ml. of ethanol is treated with 4.4 g. of N-(Z-methylphenyl)-piperazine hydrochloride and conc. hydrochloric acid (4 drops). The reaction mixture is boiled under reflux overnight, On cooling, a hygroscopic solid material separates. This is filtered ofl and the residue is taken up in Water, basified with 10% aq. sodium carbonate solution and the liberated base extracted with ether. The ethereal extract is dried over anhydrous sodium sulphate and evaporated to dryness.

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  • BE BE663344D patent/BE663344A/xx unknown
• 1964
  • 1964-05-04 CH CH579864A patent/CH489513A/de not_active IP Right Cessation
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• 1965
  • 1965-03-02 CH CH287365A patent/CH511867A/de unknown
  • 1965-04-30 DE DE19651545670 patent/DE1545670A1/de active Pending
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  • 1965-08-03 FR FR26971A patent/FR4719M/fr not_active Expired
  • 1965-08-03 FR FR26970A patent/FR4718M/fr not_active Expired
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• 1968
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